It's not possible for the IMS Enterprise plugin to create nested categories at present. However, if you create a "Biology" category (for example) as a subcategory of "Sciences", then courses marked as belonging to "Biology" will go into that subcategory.
Similarly, if you let the plugin automatically create the "Biology" category, you can then move it so it becomes a subcategory of something else.
HTH
Enrolment
IMS enterprise course catagories
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